im lookin at a 02 sensor extension kit for my 04 neon and there is two kinds of extension kits. one of them with a circle connector and one witha square which one would fit?????thanks

 

anyone

 

This brings up another question that I'll stick in here. From what I understand there are two O2 sensors in the exhaust, one above the cat and I'm not sure where the other one is but here's the question. If I do a cat delete where would I put the second O2 sensor? I know I can't just leave it out or it'd throw a code but I also don't know if it'd work right with no cat so would it just be better to spend the extra money and get a free flow cat or what?